Realization of digital filter fast algorithm

Pursuing higher speed of digital signal processing is the non-stop goal for human. When digital filter has been chosen, how to upgrade the speed of filter signal processing is a challenge for software engineer. This paper analyzes the techniques of sliding window and pipeline, and illustrates the application with two order Butterworth filter as an example. These techniques can condense the signal processing time successfully, so it's hopeful that this content can become a good reference for the signal processing engineers.